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| Book/Report | FZJ-2017-03548 |
; ;
1966
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/14450
Report No.: Juel-0374-PP
Abstract: A 15 kJ condenser bank for magnetic compression experiments is described. The operating voltage is 40 kV and the interpal inductance3 nH. The rate of rise of the current under short-circuit conditions is 1.3 $\cdot$ 10$^{13}$ A/sec. 60 units, each consisting of a40 kV /0.31 $\mu$F coaxial condenser, a pressurized spark gap, and a special current-conductor, are switched in parallel and connected to the load by means of a two-plate collector system. The spark gap inductance is 10 nH and its jitter time stays below10 nsec without resetting the electrodes in an operating range of 16 to 50 kV. This permitted a reduction of the decoupling length ofthe conductors to 1 m. Each current- conductor is composed of a coaxial transmission line with an internal inductance of 12 nH/m.For the construction of the collector system, it was essential to achieve minimum inductance and to obtain a high life time of theinsulating foil. These two requirements were fulfilled by choosing an initial insulating thicknes s of 0.6 mm, and by constructing a highlyrigid collector system that allowed a surface planeness of hetter than $\pm$ 0.01 mm and an extremely good surface quality. Large amplitude oscillations of the plates during the discharge are thus suppressed, achieving rather uniform mechanical stress. Later the insulating thickness can be further decreased to 0.4 mm thereby reaching the limit of electric stress. In a coil of 15 cm length and 42 mm diameter, magnetic fields up to 120 kG with a quarter period of 0.65 $\mu$sec have been generated.
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